As a part of an effort to bring Amazon’s Fire TV into as many living rooms as possible, the company is offering some of its customers a 30-day free trial of the Internet connected set-top box. Amazon is hand-picking participants by sending them an invite-only promotion email. If you’ve received the email, all you need to do is apply the offer and check out. Amazon will pick up the tab for now, you don’t even have to pay for shipping.

Amazon isn’t having any trouble selling its Fire TV set-top box. Immediately after launch, it quickly rose up to become the company’s best selling electronics item and hasn’t dropped since. Fire TV even managed to dethrone Google’s $35 Chromecast, proof that it’s off to a rousing start. But Amazon wants even more people to buy it, so the online retailer is offering select customers a free 30-day trial of the streaming box. The promotion is invite only, and it’s not exactly clear how Amazon is picking the lucky participants. But if you receive the above email, all it takes is hitting the “apply offer” button and a Fire TV will be added to your cart — and you won’t have to pay for it. At least not right away. (Amazon also covers shipping costs.)